1 files changed, 94 insertions, 0 deletions
diff --git a/tests/data_plane/vpp_lite_topo/scripts/dummy_mr.py b/tests/data_plane/vpp_lite_topo/scripts/dummy_mr.py
new file mode 100755
index 0000000..4740586
--- /dev/null
+++ b/tests/data_plane/vpp_lite_topo/scripts/dummy_mr.py
@@ -0,0 +1,94 @@
+#/usr/bin/env python
+
+# Simple map resolver
+#
+# This script creates an UDP socket and starts listening on it.
+# When a map-request is received nonce is extracted from the request and
+# used in map-reply.
+#
+# Notes:
+# * works only with ipv4 in both under/over-lays.
+# * exact address matching is done while looking for a mapping
+#
+# Usage:
+#   ./dummy_mr <bind-ip> <port>
+#
+
+import sys
+import socket
+
+# mapping between EIDs and RLOCs
+mappings = {
+  b'\x06\x00\x02\x02' : (b'\x06\x00\x03\x02', ),
+  b'\x06\x00\x01\x02' : (b'\x06\x00\x03\x01', )
+}
+
+# LISP map-reply message
+reply_data = (b'\x20\x00\x00\x01'   # type, PES, reserved, record count
+             + '\x00\x00\x00\x00'   # nonce
+             + '\x00\x00\x00\x00'   # nonce
+             + '\x00\x00\x05\xa0'   # record TTL
+             + '\x01\x18\x10\x00'   # loc-count, EID-len, ACT
+             + '\x00\x00\x00\x01'   # rsvd, map-version, EID-AFI=ipv4
+             + '\x06\x00\x02\x00'   # EID prefix
+             + '\x01\x01\xff\x00'   # prio, weight, mprio, mweight
+             + '\x00\x05\x00\x01'   # unused, LpR, Loc-AFI
+             + '\x06\x00\x03\x02')  # locator
+
+request_nonce_offset = 36
+reply_nonce_offset = 4
+
+request_eid_offset = 60
+reply_eid_offset = 24
+
+reply_rloc_offset = 36
+
+
+def build_reply(nonce, deid):
+  if deid not in mappings:
+    raise Exception('No mapping found for eid {}!'.format(repr(deid)))
+  m = mappings[deid]
+
+  # prepare reply data
+  reply = bytearray(reply_data)
+
+  # update rloc field in reply message
+  rloc = bytearray(m[0])
+
+  for i in range(0, 4):
+    reply[reply_rloc_offset + i] = rloc[i]
+
+  # update eid prefix field
+  for i in range(0, 4):
+    reply[reply_eid_offset + i] = deid[i]
+
+  # update nonce
+  for i in range(0, 8):
+    reply[reply_nonce_offset + i] = nonce[i]
+
+  return reply
+
+
+def run(host, port):
+  sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+  server_address = (host, int(port))
+  sock.bind(server_address)
+
+  while True:
+    data, address = sock.recvfrom(4096)
+
+    # extract nonce from request
+    nonce = data[request_nonce_offset:request_nonce_offset+8]
+
+    # extract deid
+    deid = data[request_eid_offset:request_eid_offset+4]
+
+    rp = build_reply(nonce, deid)
+    sock.sendto(rp, address)
+
+
+if __name__ == "__main__":
+  if len(sys.argv) < 2:
+    raise Exception('IP and port expected')
+
+  run(sys.argv[1], sys.argv[2])